FVXX21 KWBC 270030 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0030 UTC 27 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-492 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. UPPER WINDS FORECAST FROM THE AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: A SURFACE OBSERVATION FROM CHIMBORAZO AT 26/2200 UTC REPORTS VOLCANIC ASH OVER THE VOLCANO TO FL170 MOVING WESTWARD. SATELLITE IMAGERY THRU 2345 UTC SHOWS LOW AND MIDLE LEVEL CLOUDS OVER THE REGION MAKING ANY DETECTION OF ASH AND STEAM DIFFICULT. . TRAJECTORY: ANY ASH OR STEAM TO FL170 WOULD MOVE TOWARDS THE WEST AT 15 KTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 27/0630 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS OFTEN ACCOMPANIED BY A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS http://www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . KARST . NNNN